include/uapi/linux/usb/cdc.h

File Facts

System

Linux kernel

Corpus path

include/uapi/linux/usb/cdc.h

Extension

.h

Size

13495 bytes

Lines

466

Domain

Core OS

Bucket

Core Kernel Interface

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/types.h

Detected Declarations

• struct usb_cdc_header_desc
• struct usb_cdc_call_mgmt_descriptor
• struct usb_cdc_acm_descriptor
• struct usb_cdc_union_desc
• struct usb_cdc_country_functional_desc
• struct usb_cdc_network_terminal_desc
• struct usb_cdc_ether_desc
• struct usb_cdc_dmm_desc
• struct usb_cdc_mdlm_desc
• struct usb_cdc_mdlm_detail_desc
• struct usb_cdc_obex_desc
• struct usb_cdc_ncm_desc
• struct usb_cdc_mbim_desc
• struct usb_cdc_mbim_extended_desc
• struct usb_cdc_line_coding
• struct usb_cdc_notification
• struct usb_cdc_speed_change
• struct usb_cdc_ncm_ntb_parameters
• struct usb_cdc_ncm_nth16
• struct usb_cdc_ncm_nth32
• struct usb_cdc_ncm_dpe16
• struct usb_cdc_ncm_ndp16
• struct usb_cdc_ncm_dpe32
• struct usb_cdc_ncm_ndp32
• struct usb_cdc_ncm_ndp_input_size

Annotated Snippet

struct usb_cdc_header_desc {
	__u8	bLength;
	__u8	bDescriptorType;
	__u8	bDescriptorSubType;

	__le16	bcdCDC;
} __attribute__ ((packed));

/* "Call Management Descriptor" from CDC spec  5.2.3.2 */
struct usb_cdc_call_mgmt_descriptor {
	__u8	bLength;
	__u8	bDescriptorType;
	__u8	bDescriptorSubType;

	__u8	bmCapabilities;
#define USB_CDC_CALL_MGMT_CAP_CALL_MGMT		0x01
#define USB_CDC_CALL_MGMT_CAP_DATA_INTF		0x02

	__u8	bDataInterface;
} __attribute__ ((packed));

/* "Abstract Control Management Descriptor" from CDC spec  5.2.3.3 */
struct usb_cdc_acm_descriptor {
	__u8	bLength;
	__u8	bDescriptorType;
	__u8	bDescriptorSubType;

	__u8	bmCapabilities;
} __attribute__ ((packed));

/* capabilities from 5.2.3.3 */

#define USB_CDC_COMM_FEATURE	0x01
#define USB_CDC_CAP_LINE	0x02
#define USB_CDC_CAP_BRK		0x04
#define USB_CDC_CAP_NOTIFY	0x08

/* "Union Functional Descriptor" from CDC spec 5.2.3.8 */
struct usb_cdc_union_desc {
	__u8	bLength;
	__u8	bDescriptorType;
	__u8	bDescriptorSubType;

	__u8	bMasterInterface0;
	union {
		__u8	bSlaveInterface0;
		__DECLARE_FLEX_ARRAY(__u8, bSlaveInterfaces);
	};
} __attribute__ ((packed));

/* "Country Selection Functional Descriptor" from CDC spec 5.2.3.9 */
struct usb_cdc_country_functional_desc {
	__u8	bLength;
	__u8	bDescriptorType;
	__u8	bDescriptorSubType;

	__u8	iCountryCodeRelDate;
	union {
		__le16	wCountryCode0;
		__DECLARE_FLEX_ARRAY(__le16, wCountryCodes);
	};
} __attribute__ ((packed));

/* "Network Channel Terminal Functional Descriptor" from CDC spec 5.2.3.11 */
struct usb_cdc_network_terminal_desc {
	__u8	bLength;
	__u8	bDescriptorType;
	__u8	bDescriptorSubType;

	__u8	bEntityId;
	__u8	iName;
	__u8	bChannelIndex;
	__u8	bPhysicalInterface;
} __attribute__ ((packed));

/* "Ethernet Networking Functional Descriptor" from CDC spec 5.2.3.16 */
struct usb_cdc_ether_desc {
	__u8	bLength;
	__u8	bDescriptorType;
	__u8	bDescriptorSubType;

	__u8	iMACAddress;
	__le32	bmEthernetStatistics;
	__le16	wMaxSegmentSize;
	__le16	wNumberMCFilters;
	__u8	bNumberPowerFilters;
} __attribute__ ((packed));

/* "Telephone Control Model Functional Descriptor" from CDC WMC spec 6.3..3 */
struct usb_cdc_dmm_desc {

Annotation

• Immediate include surface: `linux/types.h`.
• Detected declarations: `struct usb_cdc_header_desc`, `struct usb_cdc_call_mgmt_descriptor`, `struct usb_cdc_acm_descriptor`, `struct usb_cdc_union_desc`, `struct usb_cdc_country_functional_desc`, `struct usb_cdc_network_terminal_desc`, `struct usb_cdc_ether_desc`, `struct usb_cdc_dmm_desc`, `struct usb_cdc_mdlm_desc`, `struct usb_cdc_mdlm_detail_desc`.
• Atlas domain: Core OS / Core Kernel Interface.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.